Acutally, in a number of years of dancing, I have worn a tail suitfor competition and for shows, but never at a social occasion.I've worn a tuxedo at a few formal parties, but tails would havebeen overdressed.

For social dancing, I originally bought a used tuxedo from a rentalshop. The disadvantage of a regular tuxedo is that the jacket isdesigned for people who keep their arms at their sides. In particular,when you take dance position, the shoulder pads tend to rise upbreak the top line. But since in social situations nobody is judgingyour top line, it's not too bad. It is just important to fit thejacket so that it does not pull when you take dance position.

For competition use, people typically have a tail suit custom made,or look for one used. If you know anyone who competes in your area,they might know of local sources for used dancewear. For social use,it might be possible to alter a regular tux jacket,